Sound-recorder for talking-machines.



PATENTED DEC. 31, 1907.

llll W. N. HUNTER. SOUND RECORDER FOR TALKING MACHINES.

APPLICATION FILED JULY 28. 1906.

WILLIAM N. HUNTER, oF BLANOHESTER, OHIO.

SOUND-REC QRDER IFOR TALKING-MACHINE Specification of Letters Patent.

' Patented Dec. 31, 1907.

Application filed July 28, 1966; Serial No. 328,172-

To all whom it may concern: v

Be it known that 1, WILLIAM N. HUNTER,

a citizen of the United States, residing at- Blanchester, county of Clinton, and Stateof Ohio, have invented certain new and useful Improvements in Sound-Recorders for Talking-Machines, Telephones, and the Like, of

which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

the Waves and deliver the vibrations into a tubular passageway, and the object of the mvention is to provide a chamber for the reception of the wave vibrations, with'a plurality of passagewa' s therefrom into the con-z ing tube, where ve (y the vibrations may be co lected, condense tofore in use. O

Heretofore it has been customary for talking machines and the like to provide a cup shaped chamber in the rear of the diaphragm, which receives .the sound vibrations, and to deliver these vibrations from. the recorder through a single central passageway. I have ascertained by repeated experiments,- however, that if an annular chamber is provided and the sound waves conveyed into the tubular passageway through av plurality of openings from this annular chamber, a very much smoother and better volume of sound is pro- 'duced, or conveyed b the apparatus.

ap aratus.

's'pective view.

e my improve construction can be employed forthe collection and conveyance of soundvibrations delivered directl into the recorder, my device is especially a apted for recorders for talking machines where the vibrations are developed'mechanically, and for such machines I have found that extraneous sounds produced by the scratching of the recordingpoint as it passes over the late or cylinder, upon which is 'im resse the record to be reproduced are a ost completely out out, so that a pure and'sweetvolume of sound is reproduced identical with the original sound; waves delivered to the n the drawings Figure 1 is Fig. 2 is a plan view 0 same.

. rial, which is held in position b My invention relates to devices for taking: and receiving the sound waves develo ed by a vibrating diaphragm, whether v1 rated directly, or by mechanical action,'to collect and delivered more perfectly than with the sound recordershere-' a central ver tical section of my 1m roved sound recorder.

Fig. 3 1s a per-- In the drawings, in order to illustrate the construction more efiectually, the device as used in connection with the ordinary talking machines is illustrated as enlarged to about twice its natural size.-

divides the chamber into an annular one is cone shaped with the truncated apex of the cone approaching very close to the diaphragm, but without touching it. The outer walls 8 of the annular chamber converge inwardly, so that a narrow base 9 1s provided for the annular chamber. From the base .of this chamber two passageways 1010 are provided which merge into the tubular passageway 2.

These passageways 10-10 are on opposite sides, and the outer wall of the annular chamber is provided with grooves 1 1 as indicated in Figs. 1 and 2, which are out spirally, as shown, to gather and direct the waves of sound towards the passageways 10.10.

When my a corder for ta ing machines, the usual arrangement is provided for conveying the v1- brations from the record cylinder, or plate, to the diaphragm by means of a pm or needle attached to the center of the diaphragm.

With the foregoing construction, it will be evident that thecentral 'vibration of the dia phra m is not directly conveyed nto the soun recorder, and'that thevibrations are received'therein .fromjthe. outer portions of the diaphragm and collected-by the grooved converging walls'into' the two ipassa eways,

which take" the vibrations from the si es.

Without endeavoring to express any theoryeoncerning this matter, I have found that with ljy construction, as heretofore stated, that the 5 seriatch-ingz-fa other mechanical sounds created-filly, ;.the paratus alrej -cutf oi1t, and-that much purer, sweeter, andrnore' natural tones are re roduced thanfiwith sound recorders in w oh the vibrations are collected and conveyed '-'-cent'rally by the recorder.

Havingthusdescribed my invention, what paratus is used as a sound re-- alkiilg machine ap-' I claim asnew and desire to secure by Letters Patent, is:

1. In a sound recorder; of the class described, a sound box, with diaphragm therefor, and a collectin chamber for the sound Waves of substantia depth, in free communi cation with and back of the diaphragm, with a central raised portion approaching, but not touching, the diaphragm, and forming an annular collecting chamber, and a tubular passageway for the conveyance of the sound waves, with an opening therefrom into theannular collecting, chamber.

2. In a sound recorder of the class described, a sound box with diaphragm there' for, a collecting chamber of substantial depth for the sound waves at the rear of the diaphra said collecting chamber bein provide with a converging outer wall, an having a central boss approaching but not touchecting chamber, and a tubu ar pas-' 9 1n% the diaphragm, so as to form an annular co chamber, said chamber being provided with converging inner and outer walls, a tubular passageway for the conveyance of the sound waves, and an opening therefrom into the annular collecting chamber.

5: In a sound recorder of the class described, a sound box having an annular collecting chamber of substantial depth formed therein, a vibratory diaphragm in connection therewith, said annular chamber being provided with a converging outer wall grooved substantially as described, a tubular passageway for the conveyance of the sound waves, and a lurality of openin s therefrom into the a u ar collecting cham er.

WILLIAM N.HUN1ER. Witnesses GLENA PRITOHARD, GEORGE BROEMMER. 

